Carbureter.



F. H. L F. O. BALL.

CARBURETER.

.APPLICATION FILED ocT. 4, I9I5.

Patented June 1S, 1918.

3 SHEETS--SHEET l.

F. H. O. BALL.

CARBURET APPUCATION man 0014, 1915.

. Patented June 18, 19l8.

3 SHEETS-SHEET 2.

F. H. 6L F. 0. BALL.

CARBURETER.

APPLICATION FILED ocT. 4, I9I5.

1,2699576. PaIenIed June I8, 1918.

3 SHEETS-SHEET 3.

UNITED STATES PATENT oEEIoE FRANK H. BALL AND FREDERICK O. BALL, 0FDETROIT, MICHIGAN, ASSIGNORS T0 BALL & BALL CARBURETOR COMPANY, OFDETROIT, MICHIGAN, A CORBORATION 0F MICHIGAN.

CABBURETER.

Specification of Letters Patent.

Patented June 18, 1918.

Application led October 4, 1915. Serial No. 58,898.

T he invention is illustrated in the accom.

panying drawings as follows Figure 1 shows 'a section through theoarbureter on the lines l-1 of Figs. 3 and 4.

Fig. 2 a section on the lines 2-2 in Figs. 3 and 5.

Fig. 3 a plan view of the carbureter.

Fig. t an elevation of the carbureter.

Fig' an elevation of the carbureter, the' point of view being at rightangles to that shown in Fig. 4.

The carbureter is formed of two main parts, 1 the body having thecontrolling devices including the mixing chamber and 2 the float chamberwith its parts. Part 1 has the mixing chamber 3 .at the upper end ofwhich there is arranged a throttle 4. The

throttle 4 is in the form of a butterfly valve mounted on the stem 4awhich extends to without the body 1. A controlling lever 5' is fixed onthe stem 4 and any convenient means (not shown) for controlling thethrottle extends from the lever 5.

The fuel is supplied to the mixln chamber through the nozzle .6. Thenozz e isarranged in a nozzle fitting 7 in the form of a screw havingthe passage 9. The fitting 7 is screwed into the nozzle passage 8, thispassage having a stepped opening, the opening of smaller diameterreceiving the fitting 7 and that part of larger diameter being ofsufiicient size to receive the head of the screw. A plug 10 is screwedinto the larger diameter of the nozzle passage. It has a central opening11 extending downwardly from its top and this is connected by arestricted radial opening 12 with an annular passage 13 formed'byreducing the size of the plug 10. A horizontal assage 14 formed in thebody 1 leads to t e` annular passage 13. The horizontal passage 14communicates withthe lower end of a tubular chamber 15. The lower endofthe tubular chamber 15 is closed by a plug 16 which has `a reducedportion forming an annular passage 17. The plug 16 is screwed into theannular chamber 15, the screw threaded portion being above thehorizontal assage 14 so that the annular passage 17 rms a means ofcommunication but the upper part of the chamber 15 is separated from themain body of this passage.' The float chamber 2 has a projection 18 withan opening through it o the same size and registering with the bottom ofthe tubular chamber 15 and the screw plug 16 extends through thisopening thus clamping the projection on the bottom of the body 1 thusforming a means of connection between the two main parts of thecarbureter. The passage 19 extends from the bottom of the float chamberto the opening in the projection 18 and forms a means of communicationbetweenthe float chamber and the annular passage 17. It will be readilyseen, therefore, that the float chamber is in direct connection with thenozzle and that the level of fuel at the nozzle will be that maintainedby the float in the float chamber.

The flow of fuel to the float chamber is controlled by the needle valve20 acting on the valve seat 21. The valve seat is ar ranged in a screwplug 22 having the axial passage 23. The screw plugl extends into ascrew threaded projection 24.- on the bottom of the float chamber. Thevalve stem 31 extends through a guide 25 at the top of the l screw plugland the axial passage in the screw plug is connected with the floatcham-y ber by the radial passages 26. The float 27 is slidingly mountedon the stem 31 and operates against the weighted levers 28.-y

TheseV levers are pivoted between the ears 29 and engage a spool 30fixed on the stem 31. 4The ears 29 extend downwardly from a: removablecover 32 and the stem extends upwardly through the cover and into arefrom the sleeve 35. The sleeve 35 is clamped on the bottom of thefioat chamberby means of the internally screw threaded plug 37 which isscrewed lonto the projection 24. The screw 37 has an axial opening 38communicating with the passage leading to the float chamber and radialopenings 39. It has an annular groove 4() extending around it and thesleeve 35 has an annular groove 36 around it, these grooves. forming achamber. strainer 41 is arranged over the screw'37 taking anintermediate position in the chamber formed by the grooves 40 and 36. Itwill be readily seen that the gasolene is strained by this strainer andthat by its annular shape sufiicient capacity is given to the strainer.

In order to readily drain the float chamber the screw plug 16 isprovided with an axial opening 42 connected with the passage 17 by theradial openings 42a. A screw plug 43 is screwed into the opening 42 andhas an axial passage 44 communicating with the opening 42. Radialpassages 45 extend from the passage 44. The head 46 of the screw plug 43seats on the bottom of the screw plug 16 around the opening 42 thusmaking a closure. A slight backing ofi' of the screw 43 forms a passagebetween the head 46 and the bottom of the screw 16 thus forming a meansfor draining the passages and float chamber.

An air passage 47 is arranged around the nozzle and forms an initial airpassage leading to the mixing chamber. The passage is so arranged thatthe air passing through it takes up the fuel from the nozzle 6. The airled through the passage 47 is taken from the passage 48 and thesecondary air passage 49 extends from the passage 48 to the mixingchamber 3. The passage 49has an extension 50 of llarger diameter -thanthe passage proper and the passage 50 lis surrounded bv a seat 51 onwhich the air valve 52 rests'. The air valve is slidingly mounted on thepin 53 carried by the adjustable nut 54. A spring 55 extends between thenut 54 and the valve 52 and resists the opening of the valve 52. Thespring may be adjusted by screwing the nut 54 in and out as desired. Apin 56 is arranged in the end of the pin 53 and prevents the escape ofthe valve 52 from the pin 53 when the nut 54 is entirely removed fromthe body of the carbureter. The large valve 52With the extension 50 onthe passage 49 limits the infiuence of the valve on the flow of air to avery short period during the initial opening of this valve. In the laterstages of the operation of 4this carbureter the flovv of air for allpractical purposes is controlled by the size of the opening 49 so thatin these llater stages the carbureter operates largely as one havingfixed orifices or passages for the air and fuel. The extent of thecontrol of the air by the valve may be varied by the nut 54.

Air is delivered to the passage 48 through an opening 57 This opening iscylindrically shaped and a choke valve 58 is arranged in this opening.The valve 58 is of the butterfly type and is mounted on a stem 59 whichextends through the Walls of the opening 57. An arm 60 is arranged onthe stem 59 by means of which the choke valve 58 may be adjusted. Inthis carbureter t-he variation in quality is accomplished by theadjustment of this choke valve. This varies the resistance to the iioWof air and consequently the quantityof fuel which is delivered with agiven reduction of pressure in the mixing chamber. For this reason theusual needle valve for adjusting the fuel flow is not necessary. Such anadjustment so varies the capacity 'of the carbureter that where thesingle apparatus is used such as is thus far described it is not usuallydesirable but Where the carbureter is supplemented as with thiscarbureter with a secondary carbureter taking care of the ultimatecapacity this adjustment is of importance because While it makes theadjustment of the pri- Amary carbureter possible Without the addibeenpractical to utilize this for the normal4 adjustment because of itseffect on the ultimate capacity of the carbureter.

The secondary carbureter is as follows Extending at a downward sla'ntfrom the mixing chamber is an opening 61. This is initially closed by abutterfly valve 62. The butterfly valve 62'is carried by a stem 63, thisstem extending through the walls of the carbureter. An arm 64 is fixedon the stem 63 (see Fig. 5). A pin 65 extends from the outer end of thisarm and the. spring 66 is secured to the pin '65 and tol apin 67arranged on the outer Wall of the carburetejr. This spring tends to holdthe valve 62 in its closed position as clearly shown in Fig. 1. A roller68 is arranged in the end of the arm 64 and this is in the path of anarm 69 extending from the throttle lever 5. The length of the arm 64With relation to the arm 69 is very short so that a comparatively slightmovement of the arm 69 will move the arm 64 suiiiciently to move thevalve 62from closed position to side open position. The

4arm 69 is so arranged relatively to the throttle lever that it contactsthe roller 68 in a late stage of the opening of the throttle and opensthe valve 62'With the full opening of the throttle.

Fuel is delivered to the secondary carbureter from the nozzle 70. Thisnozzle is arranged in a screw plug 71 having the axial v sage beinglarge enough to receive the head of the screw. The screw plug 74 isscrewed into the lower end of the passage 73. The screw plug has theaxial opening 75 from which therestricted radial opening 76 extends. Agroove 77 is arranged around the screu7 plug forming an annular passagewith which the radial opening 76 communicates. The passa 78 extends fromthe passage 14 and supp es fuel to the second nozzle. Preferabl thepassage 78 is extended through t e body and the opening is closed by thescrew 79.

In the operation of this secondary carbureter, the. opening 61 controlsthe resistance to the air and forms with the`nozzle'what is known as alixed orice carbureter, the fuel being controlled by the restrictedopenings formed by the nozzle and the opening 76 and the air beingcontrolled bythe opening 61. The relations of these passages are s'uchas to give to this secondary carbureter a richer mixture than theprimary carbureter. get maximum power a richer mixture is desirable thanthat used under ordinary conditions. The primary carbureter here shownon account of the pick-up device hereinafter described is adjusted to avery lean mixture, leaner than would be practical without such deviceand leaner than would be desirable,

except'for this secondary carbureter. The mixture from the secondacarbureter is, therefore, not only richer lthan that of the primarycarbureter but also richer than would be desirable even for maximumpower, it bein enough richer than would thus be desirab e to supplementthe lean mixture of the primary carbureter so that the mixture as awhole is richer than commonly used under ordinary conditions. This givesto the carbureter a very sensitive control, an air velocity assuringatomization and a mixture giving the greater etlicienc in the ordinaryrange of o ations, an at the same time great capacity and a rich mixturewhere high power is desired.

The valve 62 when closed cuts off the Ainliuence of the reducedpressureof the mixing chamber on the nozzle 70. This nozzle under theseconditions is subjected to atmospheric pressure.

We prefer to use a number of restricted openings arranged in series toresist the How o` fuel and thus control it. In the present instance twohave been used, the nozzle 6 and the opening 12 in the primarycarbureter and the nozzle 70 and opening 76 in the secondary carbureter.Where a single restricted opening or nozzle is used, the size of theopening must be made so small that it often clogs even wherecarefulstraining of the gasolene is resorted to. By supplementing therestricted opening at the nozzle by a second restricted opening an Thereason for-this is that to equal resistance can be accomplished withconsiderably larger openings, and the danger ofclogging is, therefore,much reduced.`

When the throttle issuddenly opened in the carbureter the mixture ismomentarily leaner than it should be and this revents a rapid pick-up.To obviate this d' culty, we have provided a device actuated by varia-.tions of pressure on the discharge side of the throttle for deliveringtothe carbureter a supply of fuel supplementing that from the regularfuel nozzle so as lto give a rapid pick-up. Y

The tubular chamber 15 is extended upwardly and is connected with thepassage 17 surrounding` the screw plug 16 through the radial openings 80in the screw plug and the axial opening 81 extending upwardly from theradial opening 80. The opening 81 is a restricted passage allowi aslight ilow of fuel into the chamber a ove the plug 16. A plunger 82 isarranged in the chamber 15 and forms a loose fit with the chamber' sothat when the plunger drops the fuel in the chamber 15 below the plungeris forced between the walls of the plunger and the chamber to the spacein t e chamber above the plunger. The plunger 82 has an extension 83 ofslightly smaller diameter than the plunger so that when the plungerdrops the space 84 above the plunger is such as to give a greater depthof fuel above the plunger. The lower` end of the plunger 82 when restingon the top of the plug 16 closes the openin 81 so -that when the plunger82 drops, fue? is maintained at a level above the plunger and in thespace 84 and above the extension 83. The cylinder 85 extends upwardlfrom the chamber 15 and the extension 6 projects from the plunger82 intothe cylinder. A piston 87 1s arrangedY on the u per` end of theextension 86 and makes a sli Vin fit with the cylinder. The upper end oft e cylinder 85 is connected by a passage 88 with the periphe of thecarbureter at the discharge side of lthe throttle so that the upper endof the cylinder is' subject-ed to variations of pressure which takeplace above the throttle. Air is admitted to the upper end of thechamber 15 throu h a passage 89 and the passage 90 extends om thechamber 15 into the mixing chamber at a point preferably just above theinitial air opening 7 v p The operation of the pick-up device is asfollows With a small opening of the throtthrottle is suddenly opened,the pressure above the throttle more nearly approximates atmosphericpressure and the difference of pressure on the piston under theseconditions will not be sufficient to retain the plunger in its upperposition and the plunger will, therefore, drop by gravity forcing thefuel below the enlarged part of the plunger to a position above it, andalso closing the opening 81. In the continued operation of thecarbureter the air entering through the passage 89 and delivered by thepassage 90 carries with it the gasolene in the upperend of the chamber15 thus momentarily enriching the mixture and insuring immediatepick-up. W'hen, however, the throttle is again moved to a. more nearlyclosed position and the pressure above the throttle is reduced thediiferenee in pressure on the piston 87 immediately lifts the plunger toits u pper position allowing the lower end of the chamber 15 to fillwith a new charge of fuel. The plunger is retained in this upperposition until the throttle is again changed. It will be noted that thedelivery of fuel for the pick up through opening 90 in no way disturbsthe normal How of fuel through the nozzles. Consequently the flowthrough the nozzles is immediately brought to the proper acceleration tobalance the air delivery. This is important in that it is thedisturbance between this equilibrium on the sudden opening of thethrottle that the pick up device is designed to neutralize.

In the ordinary adjustment of a carbureter the adjustment is acompromise, a little richer than is required for best eiciency butbetter than the extremely lean mixture for pick-up. On the other hand,this overrich mixture does not suppl the requirements when the throttleis su denly opened. With this carbureter a mixture leaner than wouldordinarily be practical can be used for ordinary running and the pick-updevice supplies all that is required for sudden openings of the throttleand the secondary carbureter the quality for extreme power.

What we claim as new is:

1. In a carbureter, the combination of a primary carbureter comprising amixing chamber, a throttle valve, a fuel nozzle, an air inlet, and meansfor varying the air inlet to vary the normal quality of mixture; and asecondary carbureter supplementing the delivery of mixture from theprimary carbureter normally out of action and comprising a fuel nozzle;an air passage leading to the mixing chamber and to which the nozzleleads, a closure valve for closing the passage, and devices actingthrough the latter portion of the opening movement of the throttle foropening the closure valve.

2. In a carbureter, the combination of a primary carbureter comprisingthe throttle valve, a rotative stem ca said valve,

a rock lever on the stem for actuating thc valve, a fuel nozzle, and anair inlet; and a secondary carbureter supplementing the delivery ofmixture from the primary carbureter normally out of action comprising afuel nozzle, an air passage to which the nozzle leads, a closure valvefor closing said passage, a rocking stem on which the closure valve ismounted, a lever on said stem, said lever being of shorter length thanthe throttle lever and arranged in the path of the throttle lever andpositioned to bc actuated as the throttle reaches the later stages ofits opening movement.

3. In a carbureter, the combination of a primary carbureter comprising athrottle valve, a rotative stem carrying said valve, a rock lever on thestem for actuating the valve, a fuel nozzle, an air inlet; and asecondary carbureter supplementing the delivery of mixture from theprimary carbureter normally out of action comprising a fuel nozzle, anair passage to which the nozzle leads; a closure valve for closing saidpassage, and a rocking stem on which the closure valve is mounted; alever on the closure valve, said lever being shorter than the lever onthe throttle and arranged in the path of said lever in position to beopened as the throttle reaches its open position and a spring operatingon the closure valve lever for maintaining the closure valve normally ina closed position.

4. In a carbureter, the combination of a .primary carbureter comprisinga mixing chamber, a throttle valve, a fuel nozzle, an air passageleading to the mixing chamber, and a yieldingr valve for said passageactuated by the movement of air through the passage; and a secondarycarbureter supplementing the delivery of mixture from the primarycarbureter and normally out df action, comprising means for augmentingthe fuel supply, a secondary air passage leading to the mixing chamber,and devices presenting a non-yielding resistance to the How of airthrough the secondary air passage comprising a closure valve for saidsecondary air passage.

5. In a carbureter, the combination of a primary carbureter comprising amixing chamber, a Athrottle valve, a fuel nozzle, an air passage leadingto the mixing chamber, and a yielding valve for said passage actu-` atedby a movement of air through the passage; and a secondary carburetersupplementing the delivery of mixture from the primary carbureter andnormally out of action comprising a secondary fuel nozzle a secondaryair passage leading to the mixing chamber and to which the secondaryfuel nozzle leads, devices presenting a non-yielding resistance to theflow of air throu h the secondary air passage comprising a c osure valvefor the-secondary air passage, and 'dcvalve, a fue1nozzle,'an air inlet,and a chokel valve for varyin the air inlet to Vary the normal qualityo? mixture; and a secondary carbureter supplementing the delivery ofmixture from the primary carbureter normally out of action andcomprising a fuel nozzle, an air passage to Which the nozzle leads, aclosure valve for closing the passage, and devices acting through thelatter portion of the opening movement of the throttle for opening'theclosure'valve.

7 In a carbureter, the combination of a mixing chamber; amain throttlevalve; a primary air passage leading to the mixing chamber; a primarygasolene jet located in the primaryy air passage; an auxiliary airpassage; a spring opposed valve controlling the flow of air through theauxiliary air passage and arranged so as to coperate with the primarygasolene jet in maintaining a practically uniform ratio of gasolene toair; a secondary air .passage leading to the mixing chamber; a secondgasolene jet located in the secondary air passage; and devicespresenting a non-yieldin resistance to the flow of air through saisecondary passage comprising a closure valve arranged to be openedduring the latter part of the opening movement of the main throttlevalve.

8. In a carbureter, the combination of a primary carbureter having amixing chamber, and throttle valve, a primary air passage leading to thelinixing chamber, a primary fuel jet located in the primary air passage,an auxiliary air passage leading to the mixing chamber, and a springopposed valve controlling said au iliary passage and arranged tocoperate Wit the primary fuel jet and primary air passage in maintaininga practically uniform ratio of fuel and air; a secondary carburetercomprising an air passage leading to the mixing chamber, devicespresenting a non-yielding resistance to the How of air through thesecondary passage comprising a closure valve for saidsecondary passage,means actuated with the throttle for operating said closure valve duringthe later stages of the opening of the throttle, and means foraugmenting the flow of fuel to the mixing chamber as the closure valveis opened.

9. In a carbureter, the Combination of a primary carbureter' comprisinga mixing chamber; a throttle valve, a fuel nozzle, an air inlet, meansfor-Varying the air inlet to vary the quality ofgmixture, an air passageleading from the inlet to the mixin chamber; and a spring closed valveinitially resisting the flow of air to the primary carbureter; and asecondary carbureter suppleinenting the delivery of mixture from the prlmary carbureter and normally out of action comprising a fuel nozzle, afixed air passage leading to the mixing chamber to which the nozzleleads; and means presenting a non-yielding resistance to the flow of airthrough said passage comprising a closure valve for closing the passage.

l0. In a carbureter, the combination of a primary 'carbureter comprisinga mixing chamber; a throttle valve controlling the flow from the mixingchamber, a fuel nozzle, and an ail' inlet; and a secondary carburetersupplementing the delivery of mixture from the primary carbureter andnormally out of actionl comprising a fuel nozzle, an air passage towhich the nozzle leads inclined to the direction ofthe flow of airthrough the mixing chamber, and a closure valve in said air passage.

11. In a carbureter, the combination of a primary carbureter providedwith a mixing chamber, and' means for supplying air and fuel to saidcarbureter in proportions to form a comparatively lean mixture; asecondary carbureter delivering to the mixing` chamber of the primarycarbureter and cornpr1s1ng a separate air passage, means for augmentingthe fuel delivered by the primary carbureter and in proportion to theair delivered through the separate air passage of the secondarycarbureter to form a mixture richer than that of the primary carbureter,and means for throwing in the primary and secondary carbureterssuccessively, the mixture being delivered in the initial stages by theprimary carbureter alone.

12. In a carbureter, the combination of a primary carbureter providedwith a mixing chamber, and means for supplying air and fuel to saidcarbureter in proportions to form a comparatively lean mixture; asecondary carbureter delivering to the mixing chamber of the primarycarbureter Comprising a separate air passage, means for delivering fuelto the secondary air passage in proportion to the air delivered throughthe separate air passage to form a mixture richer than that of theprimary carbureter, and means for throwing in the primary and secondarycarbureters successively, the mixture being delivered'in the initialstages by the primary carbureter alone.

13. In a carbureter, the combination of a primary carbureter providedwith a mixing chamber, and means for supplying air and fuel to saidcarbureter in proportions to form a comparatively lean mixture; asecondary carbureter delivering to theIlmixing chamber of the primarycarbureter and comprising a separate air passage, means for augmenting.the fuel delivered by the primary carbureter and in proportion to theair delivered through the separate air passage of the secondarycarbureter to formla mixture richer than that of the primary carbureter,means for throwing in the primary and secondary carbureterssuccessively, the mixture being delivered in the initial stages bytheprimary carbureter alone, and a pickup device acting with the openingof the throttle for supplementing the normal supply of fueldelivered bythe primary carbureter.

14:.` In a carbureter, the combination of a primary carbureter providedwith a mixing chamber, and means for supplying air and fuel to saidcarbureter in proportions to form a comparatively lean mixture; asecondary carbureter delivering to the mixing chamber of the primarycarbureter comprising a separate air passage, means for delivering fuelto the secondary air passage 1n proportion to the air delivered throughthe separate air passage to form a mixture richer than that of theprimary carbureter, means for throwing in the primary and secondarycarbureters successively, the mixture being delivered in the initialstages by the primary carbureter alone, and a pick-up device acting Withthe opening of the throttle for supplementing the normal supply of fueldelivered by the primary carbureter.

15. In a carbureter, the combination of a mixing chamber; a throttlevagve; means for delivering airr and fuel to sa d chamber; a receptacle;and a plunger in the receptacle actuated with the opening of thethrottle to discharge fuel from the receptacle to 'supplement the normalchage of fuel, said plunger acting to supplement said normal supplyWithout disturbing said normal supply.

16. In. a carbureter, the combination of a carbureter passage; athrottle controlling said passage; a fuel chamber supplying fuel to saidpassage; a'pick-up device comprising a receptacle to which fuel issupplied; a connection between the receptacle and said pas- 4 sage; avent above the normal fuel' level in the receptacle normally preventingan indrawing of fuel through said connection by suction; and meansacting with the opening of the throttle vfor forcing fuel into the pathof the air passing through the vent and connection to deliver the fuelwith the air to the mixing chamber through said connection.

17. In a carbureter, the combination of a carbureter passage; a throttlecontrolling said passage; a fuel chamber supplying fuel to said passage;a pick-up device compris, ing a receptacle to which fuel is supplied; aconnection between the receptacle and said passage; a vent above thenormal fuel level in the receptacle normally preventing an indrawing offuel through said connection by suction; and means actuated byfluctuations in the degree of vacuum at the discharge side of thethrottle for forcing the fuel into the path of the air passing throughthe vent and connection to deliver the fuel with the air to the mixingchamber through said connection.

18. In a carbureter, the combination of a carbureter passage; a throttlecontrolling said passage; a fuel chamber supplying fuel to said passage;a ick-up device comprising a receptacle to which fuel is supplied; aconnection between` the receptacle and said passage; a vent above thenormal fuel level in the receptacle normally preventing an indrawing offuel through said connection by suction; a plunger in the receptacleadapted to elevate the fuel into the path of the air passing through thevent and connection to deliver the fuel With the air to the mixingchamber through said `connection; and means acting with the opening ofthe throttle for actuating the plunger.

19. In a carbureter,l the combination of a carbureter passage; athrottle controlling said passage; a fuel chamber supplying fuel to saidpassage; a pick-up device comprising a receptacle to which fuel issupplied; a connection between the receptacle and said passage; a ventabove the normal fuel level in the receptacle -normally preventing anindrawing of fuel through said comiection by suction; a plunger in thereceptacle adapted to elevate the fuel into the path of the air passingthrough the vent and connection to deliver the fuel with the air to themixing chamber through said connection; and means actuated byfluctuations in the degree of vacuum at the discharge side of thethrottle for actuating said plunger.

20. In a carbureter, the combination of a mixing chamber; means fordelivering air and fuel to said chamber; a throttle valve; and devicesactuated by fluctuations in the degree of vacuum at the discharge sideof the throttle for momentarily supplementing the normal delivery offuel, said devices acting to augment said normal supply withoutdisturbing said normal supply.

21. In a carbureter, the combination of a mixing chamber; a throttlevalve; means for delivering air and fuel to said chamber; a pick-upreceptacle; and ldevices subjected to fluctuations of pressure at thedischarge side of the throttle and acting under the influence of suchfluctuations to fill the receptacle on the closing of the throttle andto discharge the fuel from the receptacle to supplement the normal fuelsupply when the throttle opens, said devices acting to supplement rsaidnormal fuel supply without disturbing said normal supply.

22. In a carbureter, the combination of a mixing chamber; a throttlevalve; means for delivering air and fuel to said chamber; a receptacle;and a plunger in the receptacle actuated by Huctuations of pressure atthe 130 discharge side of the throttle to discharge fuel from thereceptacle to supplement the normal charge of fuel as the throttle isopened; said plunger acting to supplement the normal supply of fuelwithout disturbing-said normal supply.

a pumpy chamber; a plunger in said chamber; a cylinder connected Withthe carbu# reter at the discharge side of the throttle; and a piston inthe cylinder connected with the plunger.

25. In a carbureter, the combination of a mixing chamber; means fordelivering air and fuel to said chamber; a throttle valve;

a pump chamber having an air passage'leading to the upper part of saidchamber and a passage leading from said chamber to the carbureter; aplunger 'in said chamber; a cylinder connected with the carbureter atthe discharge side of the throttle; and a piston in the cylinderconnected With the plunger.

26. In a carbureter, the combination of a mixing chamber; means fordelivering air and fuel to said chamber; a throttle valve; a pumpchamber; aicylinder connected with the carbureter `at the discharge sideof the throttle valve and with themixing chamber and with the outer air;a pump plunger in said chamber arralnged to permit the passage of fuelthereby; and a piston connected with the plunger in said cylinder.

27. In a carbureter, the combination of a mixing chamber; means fordelivering air and fuel tothe chamber; a throttle valve; a pump chamberand a cylinder having a connection with the carbureter at the dischargeside of the throttle and having a connection to the mixing chamber andto the outer air; a restricted opening in the bottom thereof leading tothe fuel supply; a plunger in said chamber; a piston in the cylinderconnected With the plunger, said plunger being adapted When in its lowerposition to close the fuel connection.

28. In acarbureter, the combination of a primary carbureter comprising amixing chamber, a throttle, a fuel nozzle leading to the mixinofchamber, an air inlet to the mixing cham er, and means for momentarilyand automatically supplementing the flow of fuel as the throttle isopened; a secondary carbureter comprising an air passage leading to themixing chamber, a fuel nozzle leading to said passage, a closure valvefor the passage, and means for automatically opening the closure valveas the throttle approaches open position.

29. In a carbureter, the combination of a primary carbureter comprisinga mixing chamber, a throttle, a fuel nozzle leading' to the mixingchamber, an air inlet to the mixing chamber, said fuel nozzle and air4inlet having a relation to deliver a lean mixture, and means formomentarily and automatically supplementing the flow of fuel as thethrottle is opened; a secondary carbureter comprisin an air passageleading to the mixing c amber, a fuel nozzle leading to said passage, aclosure valve for the passage, said fuel nozzle and passage having arelation to deliver a rich mixture, and means for automatically openingthe closure valve as the throttle approaches open position.

30. In a carbureter, the combination of a primary carbureter -comprisinga mixing chamber; a lthrottle valve controlling the flow ofmixture fromthe .mixing chamber; a fuel nozzle; an air inlet; and a secondarycarbureter supplementing the delivery of mixture from the primarycarbureter and normally out of action comprising a fuel nozzle; an airpassage to whichv the nozzle leads, said air passage being inclined tothe direction of flow of the air through the mixing chamber; and aclosure valve in said air passage.

In testimony whereof We have hereunto set our hands in the presence oftwo'subscribing Witnesses.

FRANK H. BALL. FREDERICK O. BALL.

Witnesses:

A. G. WADswoRTH, U. I. MURRAY.

